Catalyst and process for converting carbon oxide into methanol

Abstract

A catalyst for converting carbon oxide into methanol, which is a metal oxide including 35˜65 parts by weight of Cu, 20˜50 parts by weight of Zn, 2˜10 parts by weight of Al, and 0.1˜5 parts by weight of Si, wherein the metal oxide further includes In, Ce, or a combination thereof, and the content of In and Ce are independently 0.05 wt %˜5 wt % based on the total weight of Cu, Zn, Al, and Si in the catalyst. A process of converting carbon oxide into methanol using the above catalyst is also provided.

What is claimed is: 
     
         1 . A catalyst for converting carbon oxide into methanol, being a metal oxide comprising:
 35 to 65 parts by weight of Cu;   20 to 50 parts by weight of Zn;   2 to 10 parts by weight of Al; and   0.1 to 5 parts by weight of Si,   wherein the metal oxide further comprises In, Ce, or a combination thereof, and In and Ce are independently 0.05 wt % to 5 wt % based on the total weight of Cu, Zn, Al, and Si in the catalyst.   
     
     
         2 . The catalyst as claimed in  claim 1 , wherein the carbon oxide comprises CO 2 , CO, or a combination thereof. 
     
     
         3 . The catalyst as claimed in  claim 1 , wherein In and Ce are independently 0.1 wt % to 3 wt % based on the total weight of Cu, Zn, Al, and Si in the catalyst. 
     
     
         4 . A process of converting carbon oxide into methanol, comprising:
 putting the catalyst as claimed in  claim 1  into a fixed bed reactor; and   introducing a gas mixture of hydrogen (H 2 ) and the carbon oxide into the fixed bed reactor, and performing a first hydrogenation reaction under the effect of the catalyst to form the methanol,   wherein the carbon oxide comprises CO 2 .   
     
     
         5 . The process as claimed in  claim 4 , wherein the carbon oxide further comprises CO. 
     
     
         6 . The process as claimed in  claim 4 , wherein the first hydrogenation reaction further forms CO and water. 
     
     
         7 . The process as claimed in  claim 6 , further performing a second hydrogenation reaction, and the second hydrogenation reaction comprises:
 after separating the methanol and water out of the product of the first hydrogenation reaction, introducing the remaining CO 2 , CO, and H 2  and additional supplementary gas into the fixed bed reactor to form the methanol under the effect of the catalyst.   
     
     
         8 . The process as claimed in  claim 7 , further repeating the second hydrogenation reaction until the total yield of methanol achieves about 100%. 
     
     
         9 . The method as claimed in  claim 7 , wherein the supplementary gas comprises CO 2  and H 2 . 
     
     
         10 . The method as claimed in  claim 7 , wherein each of the first hydrogenation reaction and the second hydrogenation reaction is independently performed at a gas hourly space velocity of 3000 h −1  to 10000 h −1 . 
     
     
         11 . The method as claimed in  claim 7 , wherein each of the first hydrogenation reaction and the second hydrogenation reaction is independently performed at a temperature of 200° C. to 300° C. 
     
     
         12 . The method as claimed in  claim 7 , wherein each of the first hydrogenation reaction and the second hydrogenation reaction is independently performed under a pressure of 30 kg/cm 2  to 80 kg/cm 2 . 
     
     
         13 . A process of converting carbon oxide into methanol, utilizing the catalyst as claimed in  claim 1 . 
     
     
         14 . The process as claimed in  claim 13 , wherein the carbon oxide comprises CO 2 , CO, or a combination thereof. 
     
     
         15 . The process as claimed in  claim 13 , performed in a single fixed bed reactor.